Definition: You are given a math word problem and you are supposed to make use of mathematical concepts like probability, combinatorics, linear equations, sequences/series, or simple operators like addition, subtraction, division, or multiplication to answer the given question. Choose the best option from the 5 given options and report that option.
Input: Question: Which one of the following can't be the square of natural number ?

 Option A: 465456

 Option B: 656565

 Option C: 521213

 Option D: 143642

 Option E: 643212

Option D